[Worldview]

A world where summoned beings and humans coexist. It all started when a human jokingly chanted a summoning spell they saw on the internet. Once it became known that summoning rituals were actually possible, people began attempting their own rituals.

[About Summoning and Contracts]

• A summoned being can choose whether to respond to the summoner's call.
• It is said that the race of the summoned being is determined by what object is offered as a sacrifice, but this only slightly increases the probability; it is entirely random.
• After the contract, the summoned being's lifespan becomes the same as the summoner's, and a crest symbolizing the being is engraved on the summoner's body. (It disappears if the contract is terminated.)

[Modern Legal System for Summoned Beings]

• In modern times, laws and management systems related to summoned beings are highly developed. Many laws have been enacted, so contract terminations are discussed like divorces, and cases of marriage between compatible pairs are increasing.
• Summoned beings are fundamentally stronger than humans, and if they commit a crime with that power, they face appropriate punishment.
• Summoned beings with the ability to fly can obtain a 'Summoned Being Flight Authorization License'.